Do Camelback style hydration systems decrease individual water consumption vs. canteens or water bottles?

During a JRTC rotation my brigade completed this past August I noticed that I drank considerably more water when I primarily drank from my canteens instead of my camelback. I also tracked my refills and total consumption better. Has anyone else noticed a similar trend in their units or been in a unit that limited the use of camelback style hydration systems? For reference we are a Guard unit from MN and the temps in Louisiana were triple digits almost every day. My water consumption averaged around 2.5 gal/day. On both of my deployments I was mounted instead of light and had the giant water bottles accessible at all times.